Gage-glass fitting.



E. W. ROBERTS.

GAGE GLASS FITTING.

APPLIGATION TILED MAY 29. 1911 Patnted Mar. 18,1913.

UNITED sTATEs p grnnT EARL W. ROBERTS, OF DETROIT, MICHIGAN, ASSIGNOR TO THE 'EOBERTS BRASS MAE UFACTURING COMPANY. OF DETROIT. MICHIGAN. A CORPORATION OF MIGHIG-LN.

GAGE-GLASS FITTING.

Specification of Letters Patent.

Patented Mar. it M.

Application filed May 29. 1911. Serial No. 630,154.

To (11/ whom it may concern:

Be it known that I, EARL IV. Ronnn'rs, a citizen of the United States of America, residing at Detroit, in the county of \Vayne and State of Michigan, have invented cer tain new and useful Improvements in Gagelass Fittings, of which the following is a the accompanying drawings.

The invention relates to gageglasses more particularly designed for use on steam boilers of low pressure steam systems and pneumatic'service systems, and it is the object of the invention to provide means for sealing the fitting in case of the breaking of the glass without the use of a shut--otf valve.

To this end the invention consists in the construction as hereinafter set forth.

In the drawings,-Figure l is av front elevation of a gage to which my improvement is applied; Fig. 2 is a vertical longitudinal specification. reference being had therein to .section showing the glass as broken and the fitting sealed; Fig. 3 1s a section similar to Fig. 2 showing a. modified construction.

In the usual construction of gages for steam boilers the glass is secured to two fittings upon the boiler at different elevations,

-each of said fittings being usually provided with a shut-off valve. The lower fitting is below the normal water line of the boiler and consequently the valve is sealed by a water packing. On the other hand the upper fitting communicates with the steam space of the boiler and it is difficult to maintain a tightly packed valve which will avoid leakage of steam. Inasmuch as the only function of the valve is to close the fitting when the glass is broken, this defect may be remedied by dispensing with the valve and providing other sealing or closing. means for the fitting when the glass is broken. This I preferably accomplish by employing a valveless fitting with a sealing cap for the gage nipple detachably mounted thereon and in condition to be applied whenever needed.

In detail A is the lower fitting of the gage provided with a valve B of ordinary cons't-ruction.

C is the upper fitting having the down.

.. ,times to provide an. air vent.

the nipple D and the nipple G which engage; 4.5 the boiler. Thus under normal so there is no opportunity for escape of if the gland E is properly packed.

To provide for closing the fitti; of the breakage of the glass, cap for engaging the nippleD is provided and i". detachably mounted upon the fitting C. his mounting preferably consists of a threa stud I projecting laterally from the fitting and with which the cap H is normally en- 5 gaged. This stud not only forms a means of securing the cap but also protects the threads thereof so as to be in condition for engagement with the nipple D whenever needed. 7c

In use, whenever the glass is broken the gland E may be detached from the nipple D and the cap H may then be disengaged from the stud I and secured upon the nipple D. This will completely seal the upper fitting, while the valve B may be used for closing the lower fitting in the usual manner.

' With certain systems, such. for instance as vacuum steam systems, it is desirable at A. pet-cock so may be employed for this purpose but is open to the objection that it frequently becomes leaky. I have therefore devised e. construction of venting which consists of a screw-plug J engaging a threaded socket and having a conical nut or needle K for controlling a vent L. This plug J is located in the threaded nipple I and the latter is recessed at M to provide clearance for the head of the screw. The plug is normally seated so as to close the vent L and as a further protec tion against leakage the cap H engaging the nipple I forms an auxiliary closure. When, however, it is desired to vent the system the cap H is removed, and thcplug J loosened, which opens the vent L.

What I claim as my invention is:

1. In a gage, the-combination with a gage glass and a fitting having a gland nipple for engagement with a glass, a cap threaded to we engage the nipple, adapted to close the latter I when the glass is removed and a threaded bearing on said fitting with which said cap is normally engaged.

2. In a'gage. the combination with a fitting having a gland nipple. a gage glass en gaging the nipple, of a cap for closing said gland nipple, 'a vent plug engaging said fitid (up in a position in 1301111 u soc- [H3 for said vent plug.

the combination with :1 iiia gland nipple, a gage glass nipple of a cup for closing lid nipple dotnchably nmunted on f Hing, and a Vent plug engaging a bump i said fiiiing normally covered by said n iillL" dud beau-mg fur normuiiy 3 gaging Hie nipple, of u (up [or closing said Igiand nipple dvfzichubly mounted on said fitting, :1 recess in the bvuring with whiwh i2) said cap is dflnchabl engaged and u \Plll ping engaging said recess.

In wstimun whereof I aflix my signniui'u in presence of two witnesses.

EARL W. H 015191-11 Witnesses:

JAMES P. BARRY, 13. J. BELKNAY. 

